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Originally USE_CHROMEOS_MEDIA_ACCELERATION is only used in
//media/gpu. We plan to use it at other //media code. This CL moves
this buildflag from //media/gpu to //media.

Bug: b:149797442
Test: run `gn check` and `ninja chrome` on octopus and kevin boards
Change-Id: I7b5139d2cbfe6cdd1242ba82b428865a6af41cd2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089539Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Chih-Yu Huang <akahuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748089}